1662191 has 2 divisors, whose sum is σ = 1662192. Its totient is φ = 1662190.

The previous prime is 1662163. The next prime is 1662211. The reversal of 1662191 is 1912661.

It is a strong prime.

It is an emirp because it is prime and its reverse (1912661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1662191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1662191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1662121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831095 + 831096.

It is an arithmetic number, because the mean of its divisors is an integer number (831096).

2^1662191 is an apocalyptic number.

1662191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662191 is an equidigital number, since it uses as much as digits as its factorization.

1662191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 1662191 is about 1289.2598651940. The cubic root of 1662191 is about 118.4568852154.

The spelling of 1662191 in words is "one million, six hundred sixty-two thousand, one hundred ninety-one".